signer.go

Documentation: github.com/sassoftware/relic/signers/jar

     1  //
     2  // Copyright (c) SAS Institute Inc.
     3  //
     4  // Licensed under the Apache License, Version 2.0 (the "License");
     5  // you may not use this file except in compliance with the License.
     6  // You may obtain a copy of the License at
     7  //
     8  //     http://www.apache.org/licenses/LICENSE-2.0
     9  //
    10  // Unless required by applicable law or agreed to in writing, software
    11  // distributed under the License is distributed on an "AS IS" BASIS,
    12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  // See the License for the specific language governing permissions and
    14  // limitations under the License.
    15  //
    16  
    17  package jar
    18  
    19  // Sign Java archives
    20  
    21  import (
    22  	"archive/zip"
    23  	"io"
    24  	"os"
    25  
    26  	"github.com/sassoftware/relic/lib/certloader"
    27  	"github.com/sassoftware/relic/lib/magic"
    28  	"github.com/sassoftware/relic/lib/signjar"
    29  	"github.com/sassoftware/relic/signers"
    30  	"github.com/sassoftware/relic/signers/zipbased"
    31  )
    32  
    33  var JarSigner = &signers.Signer{
    34  	Name:      "jar",
    35  	Magic:     magic.FileTypeJAR,
    36  	CertTypes: signers.CertTypeX509,
    37  	Transform: zipbased.Transform,
    38  	Sign:      sign,
    39  	Verify:    verify,
    40  }
    41  
    42  func init() {
    43  	JarSigner.Flags().Bool("sections-only", false, "(JAR) Don't compute hash of entire manifest")
    44  	JarSigner.Flags().Bool("inline-signature", false, "(JAR) Include .SF inside the signature block")
    45  	JarSigner.Flags().Bool("apk-v2-present", false, "(JAR) Add X-Android-APK-Signed header to signature")
    46  	JarSigner.Flags().String("key-alias", "RELIC", "(JAR, APK) Alias to use for the signed manifest")
    47  	signers.Register(JarSigner)
    48  }
    49  
    50  // sign a manifest and return the PKCS#7 blob
    51  func sign(r io.Reader, cert *certloader.Certificate, opts signers.SignOpts) ([]byte, error) {
    52  	argSectionsOnly := opts.Flags.GetBool("sections-only")
    53  	argInlineSignature := opts.Flags.GetBool("inline-signature")
    54  	argApkV2 := opts.Flags.GetBool("apk-v2-present")
    55  	argAlias := opts.Flags.GetString("key-alias")
    56  	if argAlias == "" {
    57  		argAlias = "RELIC"
    58  	}
    59  	digest, err := signjar.DigestJarStream(r, opts.Hash)
    60  	if err != nil {
    61  		return nil, err
    62  	}
    63  	patch, ts, err := digest.Sign(opts.Context(), cert, argAlias, argSectionsOnly, argInlineSignature, argApkV2)
    64  	if err != nil {
    65  		return nil, err
    66  	}
    67  	opts.Audit.SetCounterSignature(ts.CounterSignature)
    68  	return opts.SetBinPatch(patch)
    69  }
    70  
    71  func verify(f *os.File, opts signers.VerifyOpts) ([]*signers.Signature, error) {
    72  	inz, err := openZip(f)
    73  	if err != nil {
    74  		return nil, err
    75  	}
    76  	sigs, err := signjar.Verify(inz, opts.NoDigests)
    77  	if err != nil {
    78  		return nil, err
    79  	}
    80  	var ret []*signers.Signature
    81  	for _, ts := range sigs {
    82  		ret = append(ret, &signers.Signature{
    83  			Hash:          ts.Hash,
    84  			X509Signature: &ts.TimestampedSignature,
    85  		})
    86  	}
    87  	return ret, nil
    88  }
    89  
    90  func openZip(f *os.File) (*zip.Reader, error) {
    91  	size, err := f.Seek(0, io.SeekEnd)
    92  	if err != nil {
    93  		return nil, err
    94  	}
    95  	f.Seek(0, 0)
    96  	return zip.NewReader(f, size)
    97  }
    98
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